Protein purified by a participant in the Protein Structure Initiative (PSI):
TargetDB. (If you are interested in collaborating to obtain the protein, please contact the Northeast Structural Genomics consortium).

ExsB: ExsB is a transcription regulator related protein. It is a subfamily of a Adenosine nucleotide binding superfamily of proteins. This protein family is represented by a single member in nearly every completed large (> 1000 genes) prokaryotic genome. In Rhizobium meliloti, a species in which the exo genes make succinoglycan, a symbiotically important exopolysaccharide, exsB is located nearby and affects succinoglycan levels, probably through polar effects on exsA expression or the same polycistronic mRNA. In Arthrobacter viscosus, the homologous gene is designated ALU1 and is associated with an aluminum tolerance phenotype. The function is unknown.... (More)

Gn_AT_II: Glutamine amidotransferases class-II (GATase). The glutaminase domain catalyzes an amide nitrogen transfer from glutamine to the appropriate substrate. In this process, glutamine is hydrolyzed to glutamic acid and ammonia. This domain is related to members of the Ntn (N-terminal nucleophile) hydrolase superfamily and is found at the N-terminus of enzymes such as glucosamine-fructose 6-phosphate synthase (GLMS or GFAT), glutamine phosphoribosylpyrophosphate (Prpp) amidotransferase (GPATase), asparagine synthetase B (AsnB), beta lactam synthetase (beta-LS) and glutamate synthase (GltS). GLMS catalyzes the formation of glucosamine 6-phosphate from fructose 6-phosphate and glutamine in amino sugar synthesis. GPATase catalyzes the first step in purine biosynthesis, an amide transfer from glutamine to PRPP, resulting in phosphoribosylamine, pyrophosphate and glutamate. Asparagine synthetase B synthesizes asparagine from aspartate and glutamine. Beta-LS catalyzes the formation of the beta-lactam ring in the beta-lactamase inhibitor clavulanic acid. GltS synthesizes L-glutamate from 2-oxoglutarate and L-glutamine. These enzymes are generally dimers, but GPATase also exists as a homotetramer..... (More)